The Temperature Dependence of the Properties of Electrolyte Solutions. V. Determination of the Glass Transition Temperature and Comparison of the Temperature Coefficients of Electrolyte Conductance and Solvent Viscosity of Propylene Carbonate Solutions

Abstract

Abstract Viscosity measurements on pure propylene carbonate and conductance measurements on solutions of 13 salts in propylene carbonate from low to high concentrations were carried out in the temperature range −45°C ≤ θ ≤ +25°C. Data analysis based on the Vogel‐Fulcher‐Tammann equation yields equal values for the glass transition temperature of propylene carbonate, T 0 , from both conductance [ T 0 = (151.6 ± 0.9) K] and viscosity [ T 0 = (152.3 ± 1.6) K] measurements. The energies of activation of conductance at infinite dilution, E ( m → 0, T ) = (3350 ± 50) [ T /( T ‐ T 0 )] 2 J mol −1 , of all the electrolyte solutions investigated are independent of the solute and equal to that of the viscosity of the solvent, E = (3420 ± 50) [ T /( T ‐ T 0 )] 2 J mol −1 , at every temperature.